package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        if (RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式错误");
        }
        String code = RandomUtil.randomNumbers(4);
//        session.setAttribute("code", code);
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);
        log.info("发送验证码成功：{}", code);
        return Result.ok("发送验证码成功");
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式错误");
        }

//        String trueCode = (String) session.getAttribute("code");
        String trueCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        if (!trueCode.equals(loginForm.getCode())){
            return Result.fail("验证码错误");
        }

        User user = this.baseMapper.selectOne(new LambdaQueryWrapper<User>().eq(User::getPhone, phone));
        if (user == null){
            // 保存用户
            user = saveUserByPhone(phone);
        }

        // session方法
        //        session.setAttribute("user", user);

        // redis方法
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        // 因为stringRedisTemplate需要key和value都为string，所以userDto的id为long就会报错
        // 需要修改beanToMap的字段值都为string，使用CopyOptions.create()来修改字段值
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        String token = UUID.randomUUID().toString();
        // 采用hash进行保存
        String key = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(key, userMap);
        // 设置有效期
        stringRedisTemplate.expire(key, LOGIN_USER_TTL, TimeUnit.MINUTES);

        return Result.ok(token);
    }

    private User saveUserByPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        this.baseMapper.insert(user);
        return user;
    }


    @Override
    public Result sign() {
        Long userId = UserHolder.getUser().getId();
        LocalDateTime now = LocalDateTime.now();
        String format = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = "sign:" + userId + format;
        // 获取今天是这个月的第几天
        int dayOfMonth = now.getDayOfMonth();
        // 签到
        stringRedisTemplate.opsForValue().setBit(key, dayOfMonth - 1, true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        Long userId = UserHolder.getUser().getId();
        LocalDateTime now = LocalDateTime.now();
        String format = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = "sign:" + userId + format;
        // 获取今天是这个月的第几天
        int dayOfMonth = now.getDayOfMonth();
        // 获取本月截至今天为止所有的签到记录
        List<Long> longList = stringRedisTemplate.opsForValue().bitField(
                key, BitFieldSubCommands.create().get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (longList == null || longList.isEmpty()){
            // 无签到记录
            return Result.ok(0);
        }
        Long num = longList.get(0);
        int count = 0;
        while(true){
            if ((num & 1) == 0){
                break;
            }
            else{
                count ++;
            }
            num >>>= 1;
        }
        return Result.ok(count);

    }
}
